# std::bitset<N>::size

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< cpp‎ | utility‎ | bitset

std::size_t size() const; |  | (noexcept since C++11) (constexpr since C++11)

Returns the number of bits that the bitset holds.

### Parameters

(none)

### Return value

number of bits that the bitset holds, i.e. the template parameter `N`.

### Example

Run this code

    #include <bitset>
    #include <iostream>

    int main()
    {
        std::cout << std::bitset<0x400>().size() << '\n';
    }

Output:

    1024

### See also

count | returns the number of bits set to true (public member function)

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